Sawing machine



ROBERTS. SAWING MACHINE. APPLICATION FILED OCT. I9, 1920.

Patented Dec. 12

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l- ROBERTS. SAWING MACHINE.

. APPLICATION FILED OCT. 19. I920- 1,438,786. v

Patented Dec. 12,1922.

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To all whom it Be it known OF ST. PAUL, MINNE l tdtfid SOTA, ASSEGNOE F ONE-HALL T0 CHARLES C.

EDWARDS, 0F MINNEAPGLIS, MINNESOTA.

Application filed October sewrns rreo'nrnn.

may COW/067%.

that I,

citizen of the United States,

Paul, in the county of of Minnesota, have inve and useful Improvements in chine; and I do hereby de ing to be a full, of the invention,

skilled in the a make and use The object ting ice,

use 111 the farm and in the sh to lumbering and ice or otherwise as may these objects in in a construction and designed to secure an ec chrectess in drive, and a ture, a preferre illustrated in wherein Figure 1 is a plan view with the parts the operation of clear, and

such as w1l rt words for view Ramsey nted certain new Irvin Ronmrrs, a

residing at ht. and State a Sawing Ma clare the followexact description 1 enable others to which it appertains to the same. a of the invention isto provide a machine which is convertlble to adapt it for use in lumberin cutting down tree timber, or in other horizontal or vertical cuts,

g operations both ln s and 1n cutting up the making either and also tor cutand which may also be adjusted for other machines on op, either incidental harvesting operations be required, and with the invention consists combination of parts onomy in power, a durability of strucd embodiment thereof being the accompanying adjusted for ot the same.

Figure 3 is a pl anism adjusted in cutting up drawings,

of the machine cutting down sectional view an view showing the mechfor making vertical cuts as (C d n 77 lengths and the like.

Figure with the parts adjusts Figure 3.

F1gure 5 is plane indicated by the ure 1.

Flgure 6 1s plane indicated Figure 7 is a side view of EtClJUStQCl for ice cutting frame mounted wheels as when analagous oper Figure is a a transverse l me a transverse by the line designed for ations.

detall view 0 and showing timber into cord 4 is a side view of the machine d as indicated in section on the 5--5 of Figsection on the 6-6 of Figure l.

the machine the upon runners instead ot lumberin and f the swinging inunicate motion through 19, 1920. Serial No. 418,011.

Figure 9 is'a similar view of the cross head mounted upon the guide bar for communicating reciprocatory motion to the saw blade.

Figure 10 is a transverse sectional view of the cross head.

Figure 11 is a side view of the machine with the parts arranged as in Figure 1 showing auxiliary means for anchoring the "frame to a tree.

Figure 12 for adjusting device.

Figure 13 is a sectional view taken on theplane indicated by the line 1313 of Figure 1. r

The mechanism consists essentially of an intermediately tulcrumed guide bar or car rier 10 upon which is mounted a reciprocatory cross head 11 for carrying the saw blade 12-, an endless traveler 13 consisting, in the construction illustrated, or a chain traversing drive and carrier sprocket wheels 14'. and 15, said chain or traveler and the sprocket wheels traversed thereby being mounted upon the guide bar or carrier for angular movement therewith to maintain the line of travel of the chain or traveler in coincidence with that of the cross head, and a pitman 16 connecting the cross head with the chain or traveler as a means of communicating motion from the latter to the former, together with suitable means for actuating the drive, sprocket wheel. In the construction illustrated the drive sprocket receives motion from a drive shaft 17 preterably mounted in fixed bearings upon a supporting frame 18 and serving to comof the means the anchoring 19 and 20 to a counter shaft 21. to which the drive sprocket is keyed or otherwise secured, the guide bar or carrier 10 being mounted upon a suitablesleeve bearing 22 concentric with said drive sprocket The drive shattmay carry a belt wheel 23 for communicating motion through a belt to other machinery to be driven and as indi cated in the drawing may be actuated by a belt 24 traversing a belt'wheel or pulley secured to said shaft 17 and a belt wheel intermeshin gears shaft 17 27 on the shaft 28 of the motor 29. It will be noted that a comparatively long drive belt 24 is employed, so as avoid the disadvantages of requiring a high tension belt, and the motor may be mounted upon guides so that it may be moved toward the drive to slack the belt when it is desired to check the movement ot saw rather than to interrupt the motion of the motor.

In the construction illustrated in Figures 1 to 43 inclusive, adapted especially for use in lumbering operations, the frame may be supported by suitable ground wheels 18 with the forward end thereof provided with an anchor bar 81 for engagement with the tree or downtimber to be cut, a se 'nient guide32 being supported by the forward end of the frame to receive and guide the forward end ofthe guide bar or carrier and also prevent undue vibration laterally o1? thesaw blade.

In making horizontal cuts, icutting down timber, the saw blade may be held to its work by means of a tensioning device consisting, for example, of a cable 33 e; tending around a direction pulley and connected with the guide bar or carrier by a tension spring 35, the other end of said cable being reeled upon drum 36 which may receive a step by step forward movement to take up the cable as the saw advances, by means of a ratchet teed mechanism 37 connected with said drum by meanso'f intermediate gearing 37 Ubviousl; whenthe machine is adjusted for making vertical cuts as in dividing up down. timber into cord ion the or otherwise, as-indicated in Figure 3, he crescent bar 32 will be disposed avertical plane and the weight of the saw blade cross head and guide arm or carrier may be reli d upon in lieu of the ratchet feed to cause the proper progressive or feeding movement of the saw, limited when the saw has passed through a given timber by means of a suitable stop 38 arranged the end of the crescent bar in the path of swinging movement of said guide bar or carrier.

It will be observed that the application of motion to the cross head which carries the saw blade is substantially the line of movement of the cross head and saw blade r gardless of the position or path of movement of the latter, due to the fact that the traveler which actuates the p' -an is mow able to correspond with the path of the sawblade, and by means of a bearing stud 39 upon which the carrier sprocket is mounted and which; is adjustably engagedavith a slot 40 in the guide arm or carrier, the desired tension of the traveler. chain may be maintained toinsure a proper and e'fiicient transmission of motion Obviously the interval betweenthe driving and carrier sprockets and the length of the traveler chain will determine the stroke of the saw blade and may be varied to suit the conditions under which the apparatus is to be employed, the preferred length of stroke in each direction being 36 inches,'so that there is a combined forward and backward stroke or travel of thesaw amounting to'siii feet. The cross head is preferably hollow to embrace the body or forward projecting arm of the guide bar or carrier as indicated in detail in the drawings, Figures 5, 9 and 10, and is'provided with a hook bolt 41 for engaging the saw blade which. is thus inter changeable to suit the'chara'eter oitth'e work to be performed.

In the readjustment of the mechanism shown in Figure 7 which adapts the machine for cutting ice the supporting frame 42 noon which] the operating mechanism, corresponding with that hereinbe'tore described is arranged, mounted upje'n run ners 43 at the side of which may be at} ranged a crescent guide 44 to be traversed by the. guide bar or carrier constructed; as above noted, and, with this arrangement of parts the guide bar or carrier which is indicated at 45-is adapted for a pendulum move: ment permitting it to swing fore and aft of the supporting frame so that after a cutie one direction has been made and the saw blade 46, which is double edged as shown in Figure 7, has been lifted out ofengage ment with the ice, the machine m'aybeshitfi ed, to posit-ion it for another out and the saw returned to engagement with them so as to operate on the return stroke, to avoid the necessity of anidie' stroke or swinging movement of the carrier in order toposition the saw for the succeedingstroke. In other words the apparatus is designed to permit or. the saw operating in both direc tions or alternately in opposite directionsas the carrier is swung forward and rearward at the side of the supporting frame.

In Figures 11 and 12 there is shown an anchoring device for holding the forward end of the machine in the proper position with relation to a tree to be out down and which is supplemental toan anchoring spike 4*? which is preferably driveninto the tree through the cross bar 31 of the frame; The arrangement or" the anchoring device is also indicated in Figure 1: Said device coir sists of an anchor pin :8 from which-ex tends a cable or chain 49 which is reeled its rear end upon a drum 50 pros ided with a ratchet 51 for, operation by a lever 52 having a suitable dog 53 and adapted to be held in its adjusted positions by a looking dog 54; A spring 55 is preferably arranged in connection with the lever, and obviously by the oscillation ofth'e' latte'rthe drum may be turned to apply the desired tension to the cable el-Q'to draw thefram'e toward thetree, and by giving the cable a wheel 55 downward inclination from the drum to ward the anchoring pin L8 it is possible to neutralize any tendency of the saw to cause an upward or lifting movement of the rear end of the frame.

It will be observed that both in the horizontally operating and vertically operating positions of the cutting mechanism, there is opportunity for a free unobstructed swinging movement thereof so that the saw may be properly positioned with reference to the timber which is being out, while the reciprocatory movement of the saw is controlled by the movement of the traveler which follows and is guided by the carrier bar, said traveler having a box-like body portion 11 flanged as indicated at 11 for engagement with the carrier bar and is provided at one end with the saw seat 9 which is intersected by a transverse slot 50 for the reception of the securing bolts 41.

In order to provide against deflection of the carrier chain which traverses the sprockets 14 and 15, due to the strain ap plied to said chain through the pitman 16, outer and inner guides 51 and 59/ are ar ranged in parallelism with the portions of the chain between said driving and carrying prockets and are supported by a plate 53 extending between spindles of said sprockets and secured by rivets or bolts, or the equivalent thereof extendingas at 54? through the plate and the carrier bar.

Moreover in order to provide for progressively actuating the apparatus when used as a saw cutting mechanism, there may be mounted upon the frame e2 as shown in Figure 7 a peripherally spiked driving supported by a swinging frame 56 fulcrumed upon the sled. frame 42, a sprocket wheel 57 carried by the spike wheel being connected by a chain 58 with a sprocket wheel 59 on the driven shaft 60 which receives motion through a belt 61 traversing pulleys or belt wheels 62 and 63 from the motor 64:, said pulley 63 being carried by the drive shaft 65 which corresponds with the drive shaft 28 of the form of the invention illustrated in Fig ures 1 to .5 inclusive and motion is communicated through the belt 66 to the shaft of the drive sprocket 67 for actuating the traveler 11 which traverses the carrier bar and supports the saw 46.

Having thus described the invention, what I claim is:-

1. A sawing machine including a bar,

reciprocating saw-actuating means on said bar, a shaft on which said bar is fulcrumed, a shaft to which said bar is transferable, means to drive said shafts, and a; driving mechanism for said reciprocating saw-actufrom which shaft ating means to be driven from either of said. shafts and carried as an entirety by said bar and transferable with said bar from one shaft to the other.

i 2. A sawing machine including a. bar, a saw-driving cross-head slidable on said bar, a plurality of sprocket wheels journaled on said bar, an endless chain trained over.

said sprocket wheels, a pitman operatively connected to said cross-head and said chain, a plurality of means selectively fulcruming the said bar operable to drive one of said sprocket wheel and said bar being transferable as a unit with said parts thereon from one of said means to the other of said means.

8. A sawing machine including a bar, reciprocatory saw actuating means on said bar, driven shafts onto which said bar may be transferred from one to the other and selectively fulcrumed, a driving mechanism for said means driven from either of said shafts and carried as an entirety by said bar consisting of a driving member attachable to said shaft, a driving member on said bar in the rear of said shafts, a pitman for said means, and a driving device for the pitman operatively associated with said driving member.

l. A power drag saw comprising a frame, angularly related supports rotatably mounted on said frame, means for rotating said supports, a saw guide transferable from one of said supports to the other, a saw mounted to reciprocate on said saw guide and transferable therewith from one support to the other, saw actuating means carried wholly by said saw, guide and transferable therewith from one support to the other and adapted to be actuated by the support upon which the saw guide is mounted.

5. A sawing machine having a plurality of supports, a' saw for transfer from one to the other of said siuoports for selective pivotal and driving mounting on said supports, means to actuate said saw and for mounting selectively on said supports, said means being transferable with said saw an entirety from one to the other of said supports, and means to drive said supports.

6. A sawing machine havine" plurality of anghlarly disposed driving members, a saw, a driving" means and a support for both transferable with said. saw and as a whole from one driving member to another.

In, testimony whereof I affix my signature in presence of two witnesses.

IRVIN ROBERTITS. 

